In 1946, A.V. Roe Canada's next design, the Avro XC-100, Canada's first jet fighter, started at the end of the era of propeller-driven aircraft and the beginning of the jet age. Although the design of the large, jet-powered all-weather interceptor, renamed the CF-100 Canuck, was largely complete by the next year, the factory was not tooled for production until late 1948 due to ongoing repair and maintenance contracts. The CF-100 would have a long gestation period before finally entering RCAF service in 1952, initially with the Mk 2 and Mk 3 variants.
The CF-100 Canuck operated under NORAD to protect airspace from Soviet threats such as nuclear-armed bombers during all weather and day/night conditions. Although not designed for speeds over Mach 0.85, it was taken supersonic during a dive by test pilot Janusz Żurakowski in December 1952.
A small number of CF-100s served with the RCAF until 1981 in reconnaissance, training and electronic warfare (ECM) roles. In its lifetime, a total of 692 CF-100s of different variants, including 53 aircraft for the Belgian Air Force, were produced.
In the 1940s, work was also underway on a jet-powered civilian short- to medium-range transport known as the C102 Jetliner. It nearly became the first jet transport in the world when it first flew in August 1949, a mere 13 days following the first flight of the de Havilland Comet. The Jetliner represented a new type of regional jet airliner that would not see comparable designs until the late 1950s. An aggressive marketing campaign was directed at U.S. airlines and the USAF.
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When the Rolls-Royce Avon AJ-65 engine was withdrawn from foreign markets by the British government, the design was modified to take four Derwent engines of higher weight and lower performance. The resulting design could no longer meet the operating range requirement of Trans-Canada Airlines (TCA). The sales prospects of the Jetliner floundered after the launch customer, TCA, withdrew from consideration of the four-engine variant. The American industrialist Howard Hughes even offered to start production under license.
The company was still attempting to get the CF-100 into production at the time and, consequently, the Canadian government cancelled any further work on the C102 due to Korean War priorities: C. D. Howe demanded the project be stopped to increase production of the CF-100, so the second C-102 prototype was scrapped in the plant in 1951, with the first relegated to photographic duties in the Flight Test Department. After a lengthy career as a camera platform and company "hack", CF-EJD-X was broken up in 1956. The nose section now resides in the Canada Aviation Museum in Ottawa.
CF-103
In 1951, during production of the CF-100 Canuck, a design was explored for a revised version with swept wings and tail modifications. Known as the CF-103, it offered transonic performance with supersonic abilities in a dive. However, the basic CF-100 continued to improve through this period, greatly eroding the comparative advantages of the new design. It was considered an interim aircraft between the CF-100 and the more advanced C-104 project, and as such development did not progress beyond creation of a full-size wooden mock-up and separate cockpit.
C104 Advanced Fighter
By 1950, several design proposals for a supersonic interceptor were explored which included versions with swept wings, a tail-less delta wing (similar to the Dassault Mirage IV), side-body engine intakes, in-nose engine intakes (similar to the MiG-21), turbine engines and rocket engines, and combinations of several.
In 1952, two versions of a design for a delta-wing fighter known as C104 were submitted to the Royal Canadian Air Force: the single engine C104/4 and twin-engined C104/2. The designs were otherwise similar, using a low-mounted delta-wing; the primary advantages of the C104/2 were a larger overall size which offered a much larger internal weapons bay, and the added reliability afforded by the additional engine. Subsequent discussions between the RCAF and Avro examined a wide range of alternatives for a supersonic interceptor, culminating in RCAF "Specification AIR 7-3" in April 1953. Avro's response to the specification became the CF-105.
CF-105 Arrow Mk.1 and Mk.2
The need for a newer and much more powerful interceptor aircraft was clear even before the CF-100 entered service. The CF-105 Arrow was rolled out on 4 October 1957, coincidentally the very same day the USSR launched Sputnik 1 into orbit, heralding the dawn of the space age and potentially the end of the Arrow's main target, the long-range bomber. The design was developed from the C104, with the delta wing raised to the top of the fuselage allowing for a simplified structure, easier access to the engines and the weapons bay in the belly, as well as a weapons bay larger than that of the B-24 Liberator or Lancaster bombers. The aircraft was very advanced, powerful, and broke numerous records. Many "firsts" were included, such as fly-by-wire technology, a new weapons fire control system, and the advanced Orenda Iroquois engine. The weapons were stored in an interchangeable pod in the internal weapons bay, allowing for ease of re-arming and switching from missiles to other kinds of weapons. Only the Mark 1 model (with lower-powered American engines) flew, including one that reached Mach 1.98. The first flight was on 25 March 1958. A total of five Mark 1 aircraft were completed, with several of the 29 Mark 2 models (with more powerful Iroquois engines) on the production line nearing completion. The sudden cancellation of the Arrow project by the Canadian government on 20 February 1959 led to a massive corporate downsizing and an attempt to further diversify. Many Avro Aircraft engineers who remained were reassigned to marine, truck and automobile projects. Numerous engineering and technical staff left Avro Canada primarily for the United Kingdom and the United States in a rapid "brain drain".
Avro aircraft experimental designs
Additional developments of the Arrow were explored by Avro's Project Research Group under the leadership of Mario Pesando.
Arrow Mk.3
Even before the Arrow first flew, Avro was designing a future version, the Mark 3. Originally designed for Mach 2.5, later revised to an estimated Mach 3 with a combat ceiling of 70,500 feet, it carried more fuel, weighed over 25% more than the Mk.2, and made greater use of CNC machining and high-temperature aluminium alloys. Also proposed was a heat shield forming an ablative insulation made from carbon fibre or fibreglass in a honeycomb matrix, later used on NASA's Mercury and Gemini programs. The engine was to be the Iroquois Mk.3, which Orenda estimated would provide 40,000 lbs of wet thrust (with afterburner). Images of the design show revised engine intakes projecting out from the fuselage to swallow the supersonic shock wave to reduce drag and increase thrust. Also proposed was capability for "probe and drogue" aerial refuelling made possible by the Arrow's revolutionary flight stability systems.
Long Range Arrow
In early 1957, studies began on how the Arrow Mk.2 might be developed into a "Long Range Arrow" to meet the requirements for the USAF's Long Range Interceptor Experimental (LRIX) program. This was thought to be suitable as under the terms of various agreements, statements, and promises to Allied and in particular Commonwealth nations, the U.S. would buy weapons from an ally if they were the best available and the Arrow seemed to fit this description. Shortly in advance of the USAF visiting Avro in 1955 to review the Arrow's development, a contract was granted to North American Aviation for design studies for the LRIX, designated the North American XF-108 Rapier. Performance requirements were for a range of 1,000 miles, Mach 3, and combat altitude of 60,000 feet. In September 1957, Avro's Project Studies PS-1 and PS-2 were released. PS-1 included addition of wingtip-mounted ramjets to supplement the main engines and a canard mounted above and behind the cockpit. PS-2 included wing extensions, an extended nose with retractable canard, two additional vertical stabilizers mounted on the wings, and four large ramjets. Estimated performance included sustained speeds of Mach 3 at 95,000 feet and vertical climb rate above 40,000 feet of Mach 2.5. The thrust-to-weight ratio would have been double the F-108 and over double the SR-71.
Arrow Mk.4
At the request of USAF Chief Scientist, a less radical modification of the Arrow than the PS-2 was pursued which became the Mark 4. The revised intakes of the Mark 3 were retained, but with smaller Curtiss-Wright ramjets, without the canards and nose extension, and with a titanium skin instead of a heat shield. Performance was reduced to Mach 3 and maximum combat altitude of 80,000 feet.
Supersonic Avrodynes
In 1952, Avro Chief Designer John Frost selected a group of eight engineers and draftsmen to create the Avro Special Projects Group. In its intense exploration of radical aeronautical design ideas and development of new technology, as well as security, the SPG resembled Lockheed's "Skunk Works". Initial projects included research and development work on a series of "flying saucer"-like vehicles. The only design that materialized beyond mock-up was the VZ-9-AV Avrocar, funded entirely by the U.S. military from 1956.
Project Y1: "the Spade"
Design reports from early 1952 outlined key features of a new gas turbine propelled engine and disc-shaped vehicle: an inner disc with central eye intake with an outer, counter-rotating disc, with rear-directed thrust nozzles, later refined to include controlling the aeroplane by thrust vectoring and stabilizing the vehicle by having the large engine rotor act as a gyroscope. The aircraft was designed for vertical take-off and landing which was thought to be hazardous and required an electronic flight-stabilization system, then not-yet available. Financed largely by Avro, the Canadian government deemed these problems too expensive to finance beyond an initial funding of $400,000. A USAF-led delegation to Avro in December 1953 gave Avro the opportunity to discuss their projects, but Y-1 was not deemed worthy of financing.
Project Y2
In mid-1954, Frost proposed "Project Y-2: Flat Vertical Take-Off Gyroplane" in response to requests by the US Air Force and US Navy for "vertical rising point-defense fighters". In late 1954, the USAF purchased the development rights to this saucer-shaped VTOL vehicle powered by more conventional engines than, and designed to avoid many of the problems with, the Y-1. The USAF designated it Project MX-1794 and studies of the Avro saucer designs Project Silver Bug. Through 1958, Avro spent $2.5 million and the USAF $5.4 million funding the project. Numerous models were constructed and wind-tunnel testing was undertaken at MIT and Wright Patterson Air Force Base (where Roswell UFO studies were reportedly undertaken).
The design included eight Armstrong Siddeley Viper turbojet engines, a very large centre rotor/impeller with Lundstrom compressor turbines, with the cockpit mounted in the top/centre. Control was achieved through eight small exhausts at the outer edge, directed either through the top or bottom, in addition to the main turbine exhaust through the bottom/centre of the craft. A multi-engine test rig was built and tested in 1956, resulting in powerful thrust and a great deal of noise, and vibration. One Special Projects Group member reported that the prototype was secretly removed by the US Navy for further testing in California.
Avro also decided to internally fund development of a radial-flow gas turbine engine vehicle, designated PV-704, which proposed no central impeller or exhaust, but rather a large spinning turbo-disc directing all thrust to the outer rim. Funding enabled continued development but was insufficient for a prototype.
In 1957, the USAF provided additional funding to extend the project, by then highly classified and designated as Weapon System 606A. The concept developed was for a circular-winged, supersonic aircraft. Over 1,000 hours of wind-tunnel testing were performed. Drawings developed by Avro show an aircraft that appears to be a merging of flying saucer with more conventional fuselage shapes, in other words a tailless aircraft with circular wings (when viewed from above or below).
Avrocar
The Avrocar, also called the Avro 'flying saucer' or Avro disc, was proposed to the U.S. Army as a type of "flying Jeep" that could also serve as a proof-of-concept test vehicle for a later supersonic flying saucer designs, PV-704 and Weapon System 606A. Two Avrocars were built, one for wind-tunnel testing at NASA Ames and the other for flight testing. The designs were underpowered and only operated in a ground-cushion effect, much like a hovercraft. When the Avrocar prototypes failed to perform at heights above three feet off the ground, the U.S. Army and USAF cancelled the project, in 1961.
Both Avrocars were on public display, one in Building 22 of the Smithsonian Paul E. Garber facility, the other at the U.S. Army Transportation Museum, Fort Eustis, Virginia. The latter Avrocar was dismantled and put into storage c. 2002, due to increasing deterioration (it was displayed outside, and the museum is very close to the ocean).
The curator of the U.S. Army Transportation Museum stated in 2008 that it would take between US$500,000 and US$600,000 to entirely restore it. Furthermore, because it is at a federal (military) installation, the work must be done by contractors, rather than volunteers. A grant of US$80,000 was received to begin restoration, however this amount was only enough to restore one piece approximately five ft by five ft.
Space Threshold Vehicle
Developed by the Advanced Projects Group, a June 1958 report by Avro's Engineering Department described a Space Threshold Vehicle intended to "get a man into the threshold of space and recover him, flying back through the corridor", where winged flight was possible between maximum altitude that could sustain lift from a winged vehicle and maximum tolerable structural temperature. This was estimated to be an altitude of between 150,000 and 200,000 feet. The STV would have had capability for in-flight refueling, and an expected speed of 6,000 mph (Mach 8.5+).
Avro's computer capacities provided capability in developing theories and methods similar to modern three-dimensional modeling of fluid dynamics. Avro envisioned a delta-shaped vehicle with downward winglets (similar to the TSR-2's), varying engine nacelle positions, titanium skin, and first flight of a research vehicle in 1962. Many engineers involved in this and similar Avro designs were later heavily involved in NASA Projects Mercury, Gemini, and Apollo.
Avroskimmer
This group of vehicle designs were variations on what later became known as hovercraft.
Avrocruisier
Avrowagon
Avroflivver
Avro P470 Mobile Ground Effect Vehicle
Other designs
Avro Canada TS-140, A Mach-2 VTOL fighter proposed to the US Navy.
XA-20 and XA-92 Bobcat, similar to designs for later armoured tracked vehicles.
Turbine-powered trucks, monorail transit.
Orenda OT-4 turbine powered White 7000 transport truck with an Allison engine.
Orenda OT-4 turbine powered M-48 Patton tank. The American M1 Abrams would be the first main battle tank in production (1980) powered by a turbine engine.
Hydrofoil Warships: When the Arrow and related programs were terminated, 12 key engineers from this team departed for De Havilland Aircraft of Canada. to work on what became HMCS Bras d'Or, possibly the world's fastest warship to present day (2011).
Canadian Applied Research
In 1957, A.V. Roe Canada acquired PSC Applied Research, a manufacturer of flight navigation computers, and renamed it Canadian Applied Research. It was later divested by Hawker Siddeley Canada and merged with de Havilland Canada's Special Products division to form SPAR Aerospace (Special Products and Applied Research), developer of the Canadarm remote manipulator system for the Space Shuttle. It is today a part of MacDonald Dettwiler as MD Robotics, a subsidiary of its MDA Space Missions division.
Other subsidiaries
Algoma Steel, minority ownership, acquired in 1957, divested in 1958.
Canadian Steel Wheel (Associated Company), existed from 1957 to 1975
Canadian Thermo Control Co existed from 1957 to 1983
